Logical connections are needed for the convenience of editing the project structure, and also affect Critical path
From end to beginning – the beginning of the second task cannot occur before the end of the first
From end to end – the end of the second task cannot occur before the end of the first
From start to start – the start of the second task cannot occur before the start of the first
From beginning to end – the end of the second task cannot occur before the beginning of the first
You cannot create a logical connection between a parent task and a child task
